Remove futility pruning depth limit
This patch removes futility pruning depth limit for child node futility pruning. In current master it was double capped by depth and by futility margin, which is also a function of depth, which didn't make much sense. passed STC https://tests.stockfishchess.org/tests/view/60e2418f9ea99d7c2d693e64 LLR: 2.95 (-2.94,2.94) <-2.50,0.50> Total: 116168 W: 9100 L: 9097 D: 97971 Ptnml(0-2): 319, 7496, 42476, 7449, 344 passed LTC https://tests.stockfishchess.org/tests/view/60e3374f9ea99d7c2d693f20 LLR: 2.96 (-2.94,2.94) <-2.50,0.50> Total: 43304 W: 1282 L: 1231 D: 40791 Ptnml(0-2): 8, 1126, 19335, 1173, 10 closes https://github.com/official-stockfish/Stockfish/pull/3606 bench 4965493pull/3616/head
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@ -780,7 +780,6 @@ namespace {
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// Step 7. Futility pruning: child node (~50 Elo)
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if ( !PvNode
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&& depth < 9
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&& eval - futility_margin(depth, improving) >= beta
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&& eval < VALUE_KNOWN_WIN) // Do not return unproven wins
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return eval;
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